I think it would be useful to be able to set some constants/parameters on the workflow.
Example 1: credentials
When working with Airtable nodes, they all use the same credentials. So, I could set on the workflow that all Airtable nodes use the same set of credentials. This could be then overwritten on the node level, e.g. one particular node specifies a different set of credentials.
Example 2: parameter
When working with Airtable, I must specify the id of the Airtable Base to interact with. In many cases the base is the same across all nodes. Currently this can be solved by either: using expressions to reference the base id from one node, or using a Set node which is not connected to the flow.
Thank you for your consideration!